Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem foi o oponente no jogo no Estádio Sullivan antes da semana 11?
 ###Tabelas: CREATE TABLE comparison_of___features (comparison_of___features_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, E-mail server VARCHAR, Faxing VARCHAR, Instant messaging VARCHAR, Telephony VARCHAR, Videoconferencing VARCHAR, Web conferencing VARCHAR, Data conferencing VARCHAR, Application sharing VARCHAR, Electronic meeting system VARCHAR, Synchronous conferencing VARCHAR) CREATE TABLE 1971_isle_of_man_sidecar_750cc_tt_final_standings (1971_isle_of_man_sidecar_750cc_tt_final_standings_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rider VARCHAR, Team VARCHAR, Speed VARCHAR, Time VARCHAR) CREATE TABLE schedule (schedule_id AUTO_INCREMENT PRIMARY KEY, Week INT, Date VARCHAR, Opponent VARCHAR, Result VARCHAR, Record VARCHAR, Game Site VARCHAR, Attendance INT) CREATE TABLE list_of_songs_released_in_2009 (list_of_songs_released_in_2009_id AUTO_INCREMENT PRIMARY KEY, Song title VARCHAR, Artist VARCHAR, Decade VARCHAR, Genre VARCHAR, Single / Pack name VARCHAR, Release date VARCHAR, Family Friendly VARCHAR, Additional Rock Band 3 Features VARCHAR) CREATE TABLE provincial_coat_of_arms (provincial_coat_of_arms_id AUTO_INCREMENT PRIMARY KEY, Year INT, Theme VARCHAR, Artist VARCHAR, Composition VARCHAR, Mintage INT, Issue Price VARCHAR)  
SELECT Opponent FROM schedule WHERE Week < 11 AND Game Site = sullivan stadium